Circulation in water-tube boilers



H. E. YARROW. CIRCULATION IN WATER TUBE BOILERS.

APPLICATION FILED OCT. 30, 1917.

Patented Aug. 17, 1920.

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UNITED STATESl HAnoLD E. YARRow, or GLASGOW, scorrLAND."

CIRCULATION IN WATER-TUBE BOILERS.

Specification of `Letters Patent. l PatentedArlg. 17.7, 1920.

Application filed October 30, 1917. Serial No. 199,311.

To all whom t may concern Be it known that I, HAROLD EDGAR YAR- Row, a subject of the King of Great Britain,

, residing in Glasgow, Scotland, have invented certain new anduseful Improvements Relating to the Circulation vin Water-Tube Boilers, of which the :following .is a specification. Y

The invention relates 'to means for improving the circulationlin water tube boilers.

The high rate of combustion now possible with oil fuel makes it advisable to increase 'the upward velocity .of the water circulavey the downward convection currents being placed onthe side away from the ire,'while those conveying the upward currents are on the side nearest tothe source of heat. As a result of experiments on a large scalemade by the inventor, it is found that motion in a circular direction, more or less following the contour of the section of the drum, is imparted to the-water as is ows from the cooler to the more heated tubes.V This motion is utilized, according to the invention, to cause a more'rapid circulation of those tubes of the nest conveying the upward cui rents which are the nearest to the source of heat. For this purpose, the Vlower ends of those tubes of the fire rows in which itis required to increase the velocity of circulation, are prolonged on one side as shown, or by means of ferrules takingthe place of the tube ends cut at the required angle, so

as to facilitate the entrance of the water.

Alternatively to, or in combination with, this formation of the tubes, baie'plates may be placed at suitable positions in the nest of the fire rows, so as to deflect the water into those tubes of the nest which are nearest to the source of heat.

In the accompanying drawings the figure is a transverse vertical section through aV boiler and a portion of the furnace through the tube plate of a water drum provided with meansA according to the inventionA for increasing the velocity of circulation in the tubes nearest to the re.

A are the tubes nearest the source of heat` G in which it is desired to increase Athe velocity, B are tubes farthest from the fire, in'which the circulation is downward, C are tubes of the fire row which receive less heat than A and in which the circulation may be less rapid. Ihe path of the water circulation in the drum is shown by the arrows. The lower ends of the tubes A are prolonged on the sides toward the tubes B to facilitate the entrance 'of the water.

As an alternative to, orin combination with, this formation of the ltubes, a bailc plate E, riveted or Vbolted to the top plate F, is shown between the second and third rows of fire tubes. -This plate may be placed between any of the rows of fire tubes as lmay be considered advisable.

Having thus'described the nature of the said invention and the best means I know of carrying the same into practical effect, I i

`circular cross section, a source of heat, and

a nest of tubes communicating with said water drum, the tubes relatively near the :soV

source of heat conveying upward currents l of water and the tubes farther' ,from the source of heat conveying downward currents of water, the lower ends of tubes nearest the source of heat terminating in oblique sections so that the part of each of said last named tubes which is turned away from the source of heat is lower than the part toward said source, substantially as described.

2. Means for obtaining an improved circulation of water in a water tube boiler, comprising a water drum of approximately circularcross section, a source of heat, a nest of tubes communicating with said Water drum, the tubes relatively. near the source of heat conveying upward currents of water and the tubes farther from the source of heat conveying downward eurrents of water, the lower ends of tubes nearest the sourceof heat terminating in oblique sections so that the part of each of said last named tubes which is .turned away from the source of heat is lower than the part toward said source, and a baffle plate secured tothe top of saiddrum and placed between the tubes so as to deflect the water into the tubes nearest the source of heat, substantially as l0 described.' 5

In testimony whereof I have signed my name to this specification in the presence of two -subseribin witnesses. Q

A, IAROLD E. YARRW. Witnesses:

JAMES RI'roHm, SiLvEsTR 

